What is the standard sea level barometric pressure?

The standard sea level barometric pressure is defined as 29.92 inches of mercury (inHg). This value is established by the International Standard Atmosphere (ISA) and is used as a reference point in aviation and meteorology to correlate atmospheric pressure readings.

The significance of this standard pressure lies in its role in altitude calculations and aircraft performance assessments. In aviation, knowing the standard pressure allows pilots to adjust altimeters accurately, ensuring that altitude measurements are consistent and can be compared with other aircraft and weather conditions. This consistency is crucial for safe navigation and operation within the airspace.

In addition, this standard helps in standardizing weather reporting and forecasting, which is vital for both pilots and meteorologists. Understanding these readings is essential for interpreting weather conditions and making informed decisions while flying.